#include <stdio.h>

int main(int argc, const char *argv[])
{
    int i = 100;
    const int *const1 = &i;
    const1 = NULL;
    //*const1 = 1000;
    int const *const2 = &i;
    const2 = NULL;
    
    int * const const3 = &i;
    *const3 = 999;
    return 0;
}
